Render of mêlée is not ideal with GuiRenderLigature 1

[kierun]

Using nvim-qt, I get this:

Using the console nvim, I get this:

Note that the font is the same in both instances so it should render fine.

Setting GuiRenderLigature 0 instead of 1 makes the problem vanish.

NVIM-QT v0.2.17.9999
Build type:
Compilation: -Wall -Wextra -Wno-unused-parameter -Wunused-variable -std=c++11
Qt Version: 5.15.2
Environment:
  nvim: nvim
  args: --cmd let &rtp.=',/home/yann/bin/../share/nvim-qt/runtime' --cmd set termguicolors
  runtime: /home/yann/bin/../share/nvim-qt/runtime

NVIM v0.5.0-dev+1455-gf83c25942
Build type: Debug
LuaJIT 2.1.0-beta3
Compilation: /usr/bin/cc -g -Wall -Wextra -pedantic -Wno-unused-parameter -Wstrict-prototypes -std=gnu99 -Wshadow -Wconversion -Wmissing-prototypes -Wimplicit-fallthrough -Wvla -fstack-protector-strong -fno-common -fdiagnostics-color=always -DINCLUDE_GENERATED_DECLARATIONS -D_GNU_SOURCE -DNVIM_MSGPACK_HAS_FLOAT32 -DNVIM_UNIBI_HAS_VAR_FROM -DMIN_LOG_LEVEL=1 -I/home/yann/src/neovim/build/config -I/home/yann/src/neovim/src -I/home/yann/src/neovim/.deps/usr/include -I/usr/include -I/home/yann/src/neovim/build/src/nvim/auto -I/home/yann/src/neovim/build/include
Compiled by [email protected]

Features: +acl +iconv +tui
See ":help feature-compile"

   system vimrc file: "$VIM/sysinit.vim"
  fall-back for $VIM: "/home/yann/nvim/share/nvim"

Run :checkhealth for more info

[jgehrig]

I cannot reproduce this issue.

What platform? (MacOS or Linux)
What font?
Does this issue appear for all fonts?

This looks like another rendering scenario that may be fixed by #781.

Sorry, I've procrastinated on that change... I don't like the code.

That PR essentially adds yet-another rendering code path. Ligatures are tricky!

[kierun]

What platform? (MacOS or Linux)

Fedora 34. 5.12.13-300.fc34.x86_64 #1 SMP Wed Jun 23 16:18:11 UTC 2021 x86_64 x86_64 x86_64 GNU/Linux

What font?

Pragmata Pro

Does this issue appear for all fonts?

Of course not… Stupid font I use… It works fine on Monoid Nerd Font.

Yeah, we can close this. Apologies for the noise.

[jgehrig]

No worries!

Sorry for the delays with PR 781... I need to finish that work.